Commit | Line | Data |
---|---|---|
fceaf24a | 1 | /* |
fceaf24a HJ |
2 | * Copyright (c) 2009, Microsoft Corporation. |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms and conditions of the GNU General Public License, | |
6 | * version 2, as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
adf8d3ff | 14 | * this program; if not, see <http://www.gnu.org/licenses/>. |
fceaf24a HJ |
15 | * |
16 | * Authors: | |
d0e94d17 | 17 | * Haiyang Zhang <haiyangz@microsoft.com> |
fceaf24a | 18 | * Hank Janssen <hjanssen@microsoft.com> |
fceaf24a | 19 | */ |
eb335bc4 HJ |
20 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
21 | ||
fceaf24a | 22 | #include <linux/init.h> |
9079ce69 | 23 | #include <linux/atomic.h> |
fceaf24a HJ |
24 | #include <linux/module.h> |
25 | #include <linux/highmem.h> | |
26 | #include <linux/device.h> | |
fceaf24a | 27 | #include <linux/io.h> |
fceaf24a HJ |
28 | #include <linux/delay.h> |
29 | #include <linux/netdevice.h> | |
30 | #include <linux/inetdevice.h> | |
31 | #include <linux/etherdevice.h> | |
32 | #include <linux/skbuff.h> | |
c802db11 | 33 | #include <linux/if_vlan.h> |
fceaf24a | 34 | #include <linux/in.h> |
5a0e3ad6 | 35 | #include <linux/slab.h> |
fceaf24a HJ |
36 | #include <net/arp.h> |
37 | #include <net/route.h> | |
38 | #include <net/sock.h> | |
39 | #include <net/pkt_sched.h> | |
3f335ea2 | 40 | |
5ca7252a | 41 | #include "hyperv_net.h" |
fceaf24a | 42 | |
fceaf24a | 43 | struct net_device_context { |
02fafbc6 | 44 | /* point back to our device context */ |
6bad88da | 45 | struct hv_device *device_ctx; |
122a5f64 | 46 | struct delayed_work dwork; |
792df872 | 47 | struct work_struct work; |
fceaf24a HJ |
48 | }; |
49 | ||
fa85a6c2 | 50 | #define RING_SIZE_MIN 64 |
99c8da0f | 51 | static int ring_size = 128; |
450d7a4b SH |
52 | module_param(ring_size, int, S_IRUGO); |
53 | MODULE_PARM_DESC(ring_size, "Ring buffer size (# of pages)"); | |
fceaf24a | 54 | |
d426b2e3 HZ |
55 | static void do_set_multicast(struct work_struct *w) |
56 | { | |
792df872 WM |
57 | struct net_device_context *ndevctx = |
58 | container_of(w, struct net_device_context, work); | |
d426b2e3 HZ |
59 | struct netvsc_device *nvdev; |
60 | struct rndis_device *rdev; | |
61 | ||
62 | nvdev = hv_get_drvdata(ndevctx->device_ctx); | |
792df872 WM |
63 | if (nvdev == NULL || nvdev->ndev == NULL) |
64 | return; | |
d426b2e3 HZ |
65 | |
66 | rdev = nvdev->extension; | |
67 | if (rdev == NULL) | |
792df872 | 68 | return; |
d426b2e3 | 69 | |
792df872 | 70 | if (nvdev->ndev->flags & IFF_PROMISC) |
d426b2e3 HZ |
71 | rndis_filter_set_packet_filter(rdev, |
72 | NDIS_PACKET_TYPE_PROMISCUOUS); | |
73 | else | |
74 | rndis_filter_set_packet_filter(rdev, | |
75 | NDIS_PACKET_TYPE_BROADCAST | | |
76 | NDIS_PACKET_TYPE_ALL_MULTICAST | | |
77 | NDIS_PACKET_TYPE_DIRECTED); | |
d426b2e3 HZ |
78 | } |
79 | ||
4e9bfefa | 80 | static void netvsc_set_multicast_list(struct net_device *net) |
fceaf24a | 81 | { |
792df872 | 82 | struct net_device_context *net_device_ctx = netdev_priv(net); |
d426b2e3 | 83 | |
792df872 | 84 | schedule_work(&net_device_ctx->work); |
fceaf24a HJ |
85 | } |
86 | ||
fceaf24a HJ |
87 | static int netvsc_open(struct net_device *net) |
88 | { | |
fceaf24a | 89 | struct net_device_context *net_device_ctx = netdev_priv(net); |
6bad88da | 90 | struct hv_device *device_obj = net_device_ctx->device_ctx; |
891de74d HZ |
91 | struct netvsc_device *nvdev; |
92 | struct rndis_device *rdev; | |
02fafbc6 | 93 | int ret = 0; |
fceaf24a | 94 | |
891de74d HZ |
95 | netif_carrier_off(net); |
96 | ||
d515d0ff HZ |
97 | /* Open up the device */ |
98 | ret = rndis_filter_open(device_obj); | |
99 | if (ret != 0) { | |
100 | netdev_err(net, "unable to open device (ret %d).\n", ret); | |
101 | return ret; | |
fceaf24a HJ |
102 | } |
103 | ||
5b54dac8 | 104 | netif_tx_start_all_queues(net); |
d515d0ff | 105 | |
891de74d HZ |
106 | nvdev = hv_get_drvdata(device_obj); |
107 | rdev = nvdev->extension; | |
108 | if (!rdev->link_state) | |
109 | netif_carrier_on(net); | |
110 | ||
fceaf24a HJ |
111 | return ret; |
112 | } | |
113 | ||
fceaf24a HJ |
114 | static int netvsc_close(struct net_device *net) |
115 | { | |
fceaf24a | 116 | struct net_device_context *net_device_ctx = netdev_priv(net); |
6bad88da | 117 | struct hv_device *device_obj = net_device_ctx->device_ctx; |
02fafbc6 | 118 | int ret; |
fceaf24a | 119 | |
0a282538 | 120 | netif_tx_disable(net); |
fceaf24a | 121 | |
792df872 WM |
122 | /* Make sure netvsc_set_multicast_list doesn't re-enable filter! */ |
123 | cancel_work_sync(&net_device_ctx->work); | |
9c26aa0d | 124 | ret = rndis_filter_close(device_obj); |
fceaf24a | 125 | if (ret != 0) |
eb335bc4 | 126 | netdev_err(net, "unable to close device (ret %d).\n", ret); |
fceaf24a | 127 | |
fceaf24a HJ |
128 | return ret; |
129 | } | |
130 | ||
8a00251a KS |
131 | static void *init_ppi_data(struct rndis_message *msg, u32 ppi_size, |
132 | int pkt_type) | |
133 | { | |
134 | struct rndis_packet *rndis_pkt; | |
135 | struct rndis_per_packet_info *ppi; | |
136 | ||
137 | rndis_pkt = &msg->msg.pkt; | |
138 | rndis_pkt->data_offset += ppi_size; | |
139 | ||
140 | ppi = (struct rndis_per_packet_info *)((void *)rndis_pkt + | |
141 | rndis_pkt->per_pkt_info_offset + rndis_pkt->per_pkt_info_len); | |
142 | ||
143 | ppi->size = ppi_size; | |
144 | ppi->type = pkt_type; | |
145 | ppi->ppi_offset = sizeof(struct rndis_per_packet_info); | |
146 | ||
147 | rndis_pkt->per_pkt_info_len += ppi_size; | |
148 | ||
149 | return ppi; | |
150 | } | |
151 | ||
5b54dac8 HZ |
152 | union sub_key { |
153 | u64 k; | |
154 | struct { | |
155 | u8 pad[3]; | |
156 | u8 kb; | |
157 | u32 ka; | |
158 | }; | |
159 | }; | |
160 | ||
161 | /* Toeplitz hash function | |
162 | * data: network byte order | |
163 | * return: host byte order | |
164 | */ | |
f88e6714 | 165 | static u32 comp_hash(u8 *key, int klen, void *data, int dlen) |
5b54dac8 HZ |
166 | { |
167 | union sub_key subk; | |
168 | int k_next = 4; | |
169 | u8 dt; | |
170 | int i, j; | |
171 | u32 ret = 0; | |
172 | ||
173 | subk.k = 0; | |
174 | subk.ka = ntohl(*(u32 *)key); | |
175 | ||
176 | for (i = 0; i < dlen; i++) { | |
177 | subk.kb = key[k_next]; | |
178 | k_next = (k_next + 1) % klen; | |
f88e6714 | 179 | dt = ((u8 *)data)[i]; |
5b54dac8 HZ |
180 | for (j = 0; j < 8; j++) { |
181 | if (dt & 0x80) | |
182 | ret ^= subk.ka; | |
183 | dt <<= 1; | |
184 | subk.k <<= 1; | |
185 | } | |
186 | } | |
187 | ||
188 | return ret; | |
189 | } | |
190 | ||
191 | static bool netvsc_set_hash(u32 *hash, struct sk_buff *skb) | |
192 | { | |
f88e6714 | 193 | struct flow_keys flow; |
5b54dac8 | 194 | int data_len; |
5b54dac8 | 195 | |
f88e6714 | 196 | if (!skb_flow_dissect(skb, &flow) || flow.n_proto != htons(ETH_P_IP)) |
5b54dac8 HZ |
197 | return false; |
198 | ||
f88e6714 HZ |
199 | if (flow.ip_proto == IPPROTO_TCP) |
200 | data_len = 12; | |
201 | else | |
202 | data_len = 8; | |
5b54dac8 | 203 | |
f88e6714 | 204 | *hash = comp_hash(netvsc_hash_key, HASH_KEYLEN, &flow, data_len); |
5b54dac8 | 205 | |
f88e6714 | 206 | return true; |
5b54dac8 HZ |
207 | } |
208 | ||
209 | static u16 netvsc_select_queue(struct net_device *ndev, struct sk_buff *skb, | |
210 | void *accel_priv, select_queue_fallback_t fallback) | |
211 | { | |
212 | struct net_device_context *net_device_ctx = netdev_priv(ndev); | |
213 | struct hv_device *hdev = net_device_ctx->device_ctx; | |
214 | struct netvsc_device *nvsc_dev = hv_get_drvdata(hdev); | |
215 | u32 hash; | |
216 | u16 q_idx = 0; | |
217 | ||
218 | if (nvsc_dev == NULL || ndev->real_num_tx_queues <= 1) | |
219 | return 0; | |
220 | ||
307f0995 | 221 | if (netvsc_set_hash(&hash, skb)) { |
5b54dac8 HZ |
222 | q_idx = nvsc_dev->send_table[hash % VRSS_SEND_TAB_SIZE] % |
223 | ndev->real_num_tx_queues; | |
307f0995 HZ |
224 | skb_set_hash(skb, hash, PKT_HASH_TYPE_L3); |
225 | } | |
5b54dac8 HZ |
226 | |
227 | return q_idx; | |
228 | } | |
229 | ||
fceaf24a HJ |
230 | static void netvsc_xmit_completion(void *context) |
231 | { | |
4193d4f4 | 232 | struct hv_netvsc_packet *packet = (struct hv_netvsc_packet *)context; |
02fafbc6 | 233 | struct sk_buff *skb = (struct sk_buff *) |
893f6627 | 234 | (unsigned long)packet->send_completion_tid; |
c25aaf81 | 235 | u32 index = packet->send_buf_index; |
fceaf24a | 236 | |
fceaf24a HJ |
237 | kfree(packet); |
238 | ||
c25aaf81 | 239 | if (skb && (index == NETVSC_INVALID_INDEX)) |
b220f5f9 | 240 | dev_kfree_skb_any(skb); |
fceaf24a HJ |
241 | } |
242 | ||
54a7357f KS |
243 | static u32 fill_pg_buf(struct page *page, u32 offset, u32 len, |
244 | struct hv_page_buffer *pb) | |
245 | { | |
246 | int j = 0; | |
247 | ||
248 | /* Deal with compund pages by ignoring unused part | |
249 | * of the page. | |
250 | */ | |
251 | page += (offset >> PAGE_SHIFT); | |
252 | offset &= ~PAGE_MASK; | |
253 | ||
254 | while (len > 0) { | |
255 | unsigned long bytes; | |
256 | ||
257 | bytes = PAGE_SIZE - offset; | |
258 | if (bytes > len) | |
259 | bytes = len; | |
260 | pb[j].pfn = page_to_pfn(page); | |
261 | pb[j].offset = offset; | |
262 | pb[j].len = bytes; | |
263 | ||
264 | offset += bytes; | |
265 | len -= bytes; | |
266 | ||
267 | if (offset == PAGE_SIZE && len) { | |
268 | page++; | |
269 | offset = 0; | |
270 | j++; | |
271 | } | |
272 | } | |
273 | ||
274 | return j + 1; | |
275 | } | |
276 | ||
8a00251a KS |
277 | static u32 init_page_array(void *hdr, u32 len, struct sk_buff *skb, |
278 | struct hv_page_buffer *pb) | |
54a7357f KS |
279 | { |
280 | u32 slots_used = 0; | |
281 | char *data = skb->data; | |
282 | int frags = skb_shinfo(skb)->nr_frags; | |
283 | int i; | |
284 | ||
285 | /* The packet is laid out thus: | |
286 | * 1. hdr | |
287 | * 2. skb linear data | |
288 | * 3. skb fragment data | |
289 | */ | |
290 | if (hdr != NULL) | |
291 | slots_used += fill_pg_buf(virt_to_page(hdr), | |
292 | offset_in_page(hdr), | |
293 | len, &pb[slots_used]); | |
294 | ||
295 | slots_used += fill_pg_buf(virt_to_page(data), | |
296 | offset_in_page(data), | |
297 | skb_headlen(skb), &pb[slots_used]); | |
298 | ||
299 | for (i = 0; i < frags; i++) { | |
300 | skb_frag_t *frag = skb_shinfo(skb)->frags + i; | |
301 | ||
302 | slots_used += fill_pg_buf(skb_frag_page(frag), | |
303 | frag->page_offset, | |
304 | skb_frag_size(frag), &pb[slots_used]); | |
305 | } | |
8a00251a | 306 | return slots_used; |
54a7357f KS |
307 | } |
308 | ||
309 | static int count_skb_frag_slots(struct sk_buff *skb) | |
310 | { | |
311 | int i, frags = skb_shinfo(skb)->nr_frags; | |
312 | int pages = 0; | |
313 | ||
314 | for (i = 0; i < frags; i++) { | |
315 | skb_frag_t *frag = skb_shinfo(skb)->frags + i; | |
316 | unsigned long size = skb_frag_size(frag); | |
317 | unsigned long offset = frag->page_offset; | |
318 | ||
319 | /* Skip unused frames from start of page */ | |
320 | offset &= ~PAGE_MASK; | |
321 | pages += PFN_UP(offset + size); | |
322 | } | |
323 | return pages; | |
324 | } | |
325 | ||
326 | static int netvsc_get_slots(struct sk_buff *skb) | |
327 | { | |
328 | char *data = skb->data; | |
329 | unsigned int offset = offset_in_page(data); | |
330 | unsigned int len = skb_headlen(skb); | |
331 | int slots; | |
332 | int frag_slots; | |
333 | ||
334 | slots = DIV_ROUND_UP(offset + len, PAGE_SIZE); | |
335 | frag_slots = count_skb_frag_slots(skb); | |
336 | return slots + frag_slots; | |
337 | } | |
338 | ||
08cd04bf KS |
339 | static u32 get_net_transport_info(struct sk_buff *skb, u32 *trans_off) |
340 | { | |
341 | u32 ret_val = TRANSPORT_INFO_NOT_IP; | |
342 | ||
343 | if ((eth_hdr(skb)->h_proto != htons(ETH_P_IP)) && | |
344 | (eth_hdr(skb)->h_proto != htons(ETH_P_IPV6))) { | |
345 | goto not_ip; | |
346 | } | |
347 | ||
348 | *trans_off = skb_transport_offset(skb); | |
349 | ||
350 | if ((eth_hdr(skb)->h_proto == htons(ETH_P_IP))) { | |
351 | struct iphdr *iphdr = ip_hdr(skb); | |
352 | ||
353 | if (iphdr->protocol == IPPROTO_TCP) | |
354 | ret_val = TRANSPORT_INFO_IPV4_TCP; | |
355 | else if (iphdr->protocol == IPPROTO_UDP) | |
356 | ret_val = TRANSPORT_INFO_IPV4_UDP; | |
357 | } else { | |
358 | if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP) | |
359 | ret_val = TRANSPORT_INFO_IPV6_TCP; | |
360 | else if (ipv6_hdr(skb)->nexthdr == IPPROTO_UDP) | |
361 | ret_val = TRANSPORT_INFO_IPV6_UDP; | |
362 | } | |
363 | ||
364 | not_ip: | |
365 | return ret_val; | |
366 | } | |
367 | ||
02fafbc6 | 368 | static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net) |
fceaf24a | 369 | { |
fceaf24a | 370 | struct net_device_context *net_device_ctx = netdev_priv(net); |
4193d4f4 | 371 | struct hv_netvsc_packet *packet; |
02fafbc6 | 372 | int ret; |
8a00251a KS |
373 | unsigned int num_data_pgs; |
374 | struct rndis_message *rndis_msg; | |
375 | struct rndis_packet *rndis_pkt; | |
376 | u32 rndis_msg_size; | |
377 | bool isvlan; | |
378 | struct rndis_per_packet_info *ppi; | |
08cd04bf | 379 | struct ndis_tcp_ip_checksum_info *csum_info; |
77bf5487 | 380 | struct ndis_tcp_lso_info *lso_info; |
08cd04bf KS |
381 | int hdr_offset; |
382 | u32 net_trans_info; | |
307f0995 | 383 | u32 hash; |
dedb845d | 384 | u32 skb_length = skb->len; |
08cd04bf | 385 | |
fceaf24a | 386 | |
54a7357f KS |
387 | /* We will atmost need two pages to describe the rndis |
388 | * header. We can only transmit MAX_PAGE_BUFFER_COUNT number | |
389 | * of pages in a single packet. | |
390 | */ | |
8a00251a KS |
391 | num_data_pgs = netvsc_get_slots(skb) + 2; |
392 | if (num_data_pgs > MAX_PAGE_BUFFER_COUNT) { | |
54a7357f KS |
393 | netdev_err(net, "Packet too big: %u\n", skb->len); |
394 | dev_kfree_skb(skb); | |
395 | net->stats.tx_dropped++; | |
396 | return NETDEV_TX_OK; | |
397 | } | |
fceaf24a | 398 | |
454f18a9 | 399 | /* Allocate a netvsc packet based on # of frags. */ |
02fafbc6 | 400 | packet = kzalloc(sizeof(struct hv_netvsc_packet) + |
8a00251a | 401 | (num_data_pgs * sizeof(struct hv_page_buffer)) + |
86eedacc | 402 | sizeof(struct rndis_message) + |
307f0995 HZ |
403 | NDIS_VLAN_PPI_SIZE + NDIS_CSUM_PPI_SIZE + |
404 | NDIS_LSO_PPI_SIZE + NDIS_HASH_PPI_SIZE, GFP_ATOMIC); | |
02fafbc6 | 405 | if (!packet) { |
bf769375 | 406 | /* out of memory, drop packet */ |
eb335bc4 | 407 | netdev_err(net, "unable to allocate hv_netvsc_packet\n"); |
b220f5f9 SH |
408 | |
409 | dev_kfree_skb(skb); | |
410 | net->stats.tx_dropped++; | |
bb6d5e76 | 411 | return NETDEV_TX_OK; |
fceaf24a HJ |
412 | } |
413 | ||
1f5f3a75 HZ |
414 | packet->vlan_tci = skb->vlan_tci; |
415 | ||
5b54dac8 HZ |
416 | packet->q_idx = skb_get_queue_mapping(skb); |
417 | ||
8a00251a | 418 | packet->is_data_pkt = true; |
4d447c9a | 419 | packet->total_data_buflen = skb->len; |
fceaf24a | 420 | |
8a00251a KS |
421 | packet->rndis_msg = (struct rndis_message *)((unsigned long)packet + |
422 | sizeof(struct hv_netvsc_packet) + | |
423 | (num_data_pgs * sizeof(struct hv_page_buffer))); | |
fceaf24a | 424 | |
454f18a9 | 425 | /* Set the completion routine */ |
893f6627 HZ |
426 | packet->send_completion = netvsc_xmit_completion; |
427 | packet->send_completion_ctx = packet; | |
428 | packet->send_completion_tid = (unsigned long)skb; | |
fceaf24a | 429 | |
8a00251a KS |
430 | isvlan = packet->vlan_tci & VLAN_TAG_PRESENT; |
431 | ||
432 | /* Add the rndis header */ | |
433 | rndis_msg = packet->rndis_msg; | |
434 | rndis_msg->ndis_msg_type = RNDIS_MSG_PACKET; | |
435 | rndis_msg->msg_len = packet->total_data_buflen; | |
436 | rndis_pkt = &rndis_msg->msg.pkt; | |
437 | rndis_pkt->data_offset = sizeof(struct rndis_packet); | |
438 | rndis_pkt->data_len = packet->total_data_buflen; | |
439 | rndis_pkt->per_pkt_info_offset = sizeof(struct rndis_packet); | |
440 | ||
441 | rndis_msg_size = RNDIS_MESSAGE_SIZE(struct rndis_packet); | |
442 | ||
307f0995 HZ |
443 | hash = skb_get_hash_raw(skb); |
444 | if (hash != 0 && net->real_num_tx_queues > 1) { | |
445 | rndis_msg_size += NDIS_HASH_PPI_SIZE; | |
446 | ppi = init_ppi_data(rndis_msg, NDIS_HASH_PPI_SIZE, | |
447 | NBL_HASH_VALUE); | |
448 | *(u32 *)((void *)ppi + ppi->ppi_offset) = hash; | |
449 | } | |
450 | ||
8a00251a KS |
451 | if (isvlan) { |
452 | struct ndis_pkt_8021q_info *vlan; | |
453 | ||
454 | rndis_msg_size += NDIS_VLAN_PPI_SIZE; | |
455 | ppi = init_ppi_data(rndis_msg, NDIS_VLAN_PPI_SIZE, | |
456 | IEEE_8021Q_INFO); | |
457 | vlan = (struct ndis_pkt_8021q_info *)((void *)ppi + | |
458 | ppi->ppi_offset); | |
459 | vlan->vlanid = packet->vlan_tci & VLAN_VID_MASK; | |
460 | vlan->pri = (packet->vlan_tci & VLAN_PRIO_MASK) >> | |
461 | VLAN_PRIO_SHIFT; | |
462 | } | |
463 | ||
08cd04bf KS |
464 | net_trans_info = get_net_transport_info(skb, &hdr_offset); |
465 | if (net_trans_info == TRANSPORT_INFO_NOT_IP) | |
466 | goto do_send; | |
467 | ||
468 | /* | |
469 | * Setup the sendside checksum offload only if this is not a | |
470 | * GSO packet. | |
471 | */ | |
472 | if (skb_is_gso(skb)) | |
77bf5487 | 473 | goto do_lso; |
08cd04bf | 474 | |
22041fb0 KS |
475 | if ((skb->ip_summed == CHECKSUM_NONE) || |
476 | (skb->ip_summed == CHECKSUM_UNNECESSARY)) | |
477 | goto do_send; | |
478 | ||
08cd04bf KS |
479 | rndis_msg_size += NDIS_CSUM_PPI_SIZE; |
480 | ppi = init_ppi_data(rndis_msg, NDIS_CSUM_PPI_SIZE, | |
481 | TCPIP_CHKSUM_PKTINFO); | |
482 | ||
483 | csum_info = (struct ndis_tcp_ip_checksum_info *)((void *)ppi + | |
484 | ppi->ppi_offset); | |
485 | ||
486 | if (net_trans_info & (INFO_IPV4 << 16)) | |
487 | csum_info->transmit.is_ipv4 = 1; | |
488 | else | |
489 | csum_info->transmit.is_ipv6 = 1; | |
490 | ||
491 | if (net_trans_info & INFO_TCP) { | |
492 | csum_info->transmit.tcp_checksum = 1; | |
493 | csum_info->transmit.tcp_header_offset = hdr_offset; | |
494 | } else if (net_trans_info & INFO_UDP) { | |
af9893a3 KS |
495 | /* UDP checksum offload is not supported on ws2008r2. |
496 | * Furthermore, on ws2012 and ws2012r2, there are some | |
497 | * issues with udp checksum offload from Linux guests. | |
498 | * (these are host issues). | |
499 | * For now compute the checksum here. | |
500 | */ | |
501 | struct udphdr *uh; | |
502 | u16 udp_len; | |
503 | ||
504 | ret = skb_cow_head(skb, 0); | |
505 | if (ret) | |
506 | goto drop; | |
507 | ||
508 | uh = udp_hdr(skb); | |
509 | udp_len = ntohs(uh->len); | |
510 | uh->check = 0; | |
511 | uh->check = csum_tcpudp_magic(ip_hdr(skb)->saddr, | |
512 | ip_hdr(skb)->daddr, | |
513 | udp_len, IPPROTO_UDP, | |
514 | csum_partial(uh, udp_len, 0)); | |
515 | if (uh->check == 0) | |
516 | uh->check = CSUM_MANGLED_0; | |
517 | ||
518 | csum_info->transmit.udp_checksum = 0; | |
08cd04bf | 519 | } |
77bf5487 KS |
520 | goto do_send; |
521 | ||
522 | do_lso: | |
523 | rndis_msg_size += NDIS_LSO_PPI_SIZE; | |
524 | ppi = init_ppi_data(rndis_msg, NDIS_LSO_PPI_SIZE, | |
525 | TCP_LARGESEND_PKTINFO); | |
526 | ||
527 | lso_info = (struct ndis_tcp_lso_info *)((void *)ppi + | |
528 | ppi->ppi_offset); | |
529 | ||
530 | lso_info->lso_v2_transmit.type = NDIS_TCP_LARGE_SEND_OFFLOAD_V2_TYPE; | |
531 | if (net_trans_info & (INFO_IPV4 << 16)) { | |
532 | lso_info->lso_v2_transmit.ip_version = | |
533 | NDIS_TCP_LARGE_SEND_OFFLOAD_IPV4; | |
534 | ip_hdr(skb)->tot_len = 0; | |
535 | ip_hdr(skb)->check = 0; | |
536 | tcp_hdr(skb)->check = | |
537 | ~csum_tcpudp_magic(ip_hdr(skb)->saddr, | |
538 | ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0); | |
539 | } else { | |
540 | lso_info->lso_v2_transmit.ip_version = | |
541 | NDIS_TCP_LARGE_SEND_OFFLOAD_IPV6; | |
542 | ipv6_hdr(skb)->payload_len = 0; | |
543 | tcp_hdr(skb)->check = | |
544 | ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr, | |
545 | &ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0); | |
546 | } | |
547 | lso_info->lso_v2_transmit.tcp_header_offset = hdr_offset; | |
548 | lso_info->lso_v2_transmit.mss = skb_shinfo(skb)->gso_size; | |
08cd04bf KS |
549 | |
550 | do_send: | |
8a00251a KS |
551 | /* Start filling in the page buffers with the rndis hdr */ |
552 | rndis_msg->msg_len += rndis_msg_size; | |
942396b0 | 553 | packet->total_data_buflen = rndis_msg->msg_len; |
8a00251a KS |
554 | packet->page_buf_cnt = init_page_array(rndis_msg, rndis_msg_size, |
555 | skb, &packet->page_buf[0]); | |
556 | ||
557 | ret = netvsc_send(net_device_ctx->device_ctx, packet); | |
558 | ||
af9893a3 | 559 | drop: |
02fafbc6 | 560 | if (ret == 0) { |
dedb845d | 561 | net->stats.tx_bytes += skb_length; |
b852fdce | 562 | net->stats.tx_packets++; |
b220f5f9 | 563 | } else { |
8a5f9edc | 564 | kfree(packet); |
33be96e4 HZ |
565 | if (ret != -EAGAIN) { |
566 | dev_kfree_skb_any(skb); | |
567 | net->stats.tx_dropped++; | |
568 | } | |
fceaf24a HJ |
569 | } |
570 | ||
33be96e4 | 571 | return (ret == -EAGAIN) ? NETDEV_TX_BUSY : NETDEV_TX_OK; |
fceaf24a HJ |
572 | } |
573 | ||
3e189519 | 574 | /* |
02fafbc6 GKH |
575 | * netvsc_linkstatus_callback - Link up/down notification |
576 | */ | |
90ef117a | 577 | void netvsc_linkstatus_callback(struct hv_device *device_obj, |
3a494e71 | 578 | struct rndis_message *resp) |
fceaf24a | 579 | { |
3a494e71 | 580 | struct rndis_indicate_status *indicate = &resp->msg.indicate_status; |
2ddd5e5f | 581 | struct net_device *net; |
c996edcf | 582 | struct net_device_context *ndev_ctx; |
2ddd5e5f | 583 | struct netvsc_device *net_device; |
891de74d | 584 | struct rndis_device *rdev; |
2ddd5e5f S |
585 | |
586 | net_device = hv_get_drvdata(device_obj); | |
891de74d HZ |
587 | rdev = net_device->extension; |
588 | ||
3a494e71 HZ |
589 | switch (indicate->status) { |
590 | case RNDIS_STATUS_MEDIA_CONNECT: | |
591 | rdev->link_state = false; | |
592 | break; | |
593 | case RNDIS_STATUS_MEDIA_DISCONNECT: | |
594 | rdev->link_state = true; | |
595 | break; | |
596 | case RNDIS_STATUS_NETWORK_CHANGE: | |
597 | rdev->link_change = true; | |
598 | break; | |
599 | default: | |
600 | return; | |
601 | } | |
891de74d | 602 | |
2ddd5e5f | 603 | net = net_device->ndev; |
fceaf24a | 604 | |
891de74d | 605 | if (!net || net->reg_state != NETREG_REGISTERED) |
fceaf24a | 606 | return; |
fceaf24a | 607 | |
891de74d | 608 | ndev_ctx = netdev_priv(net); |
3a494e71 | 609 | if (!rdev->link_state) { |
c4b6a2ea | 610 | schedule_delayed_work(&ndev_ctx->dwork, 0); |
122a5f64 | 611 | schedule_delayed_work(&ndev_ctx->dwork, msecs_to_jiffies(20)); |
02fafbc6 | 612 | } else { |
891de74d | 613 | schedule_delayed_work(&ndev_ctx->dwork, 0); |
fceaf24a | 614 | } |
fceaf24a HJ |
615 | } |
616 | ||
3e189519 HJ |
617 | /* |
618 | * netvsc_recv_callback - Callback when we receive a packet from the | |
619 | * "wire" on the specified device. | |
02fafbc6 | 620 | */ |
f79adf8f | 621 | int netvsc_recv_callback(struct hv_device *device_obj, |
e3d605ed KS |
622 | struct hv_netvsc_packet *packet, |
623 | struct ndis_tcp_ip_checksum_info *csum_info) | |
fceaf24a | 624 | { |
6f4c4446 | 625 | struct net_device *net; |
fceaf24a | 626 | struct sk_buff *skb; |
fceaf24a | 627 | |
6f4c4446 | 628 | net = ((struct netvsc_device *)hv_get_drvdata(device_obj))->ndev; |
a68f9614 | 629 | if (!net || net->reg_state != NETREG_REGISTERED) { |
63f6921d | 630 | packet->status = NVSP_STAT_FAIL; |
fceaf24a HJ |
631 | return 0; |
632 | } | |
633 | ||
9495c282 | 634 | /* Allocate a skb - TODO direct I/O to pages? */ |
72a2f5bd | 635 | skb = netdev_alloc_skb_ip_align(net, packet->total_data_buflen); |
9495c282 SH |
636 | if (unlikely(!skb)) { |
637 | ++net->stats.rx_dropped; | |
63f6921d | 638 | packet->status = NVSP_STAT_FAIL; |
9495c282 SH |
639 | return 0; |
640 | } | |
fceaf24a | 641 | |
02fafbc6 GKH |
642 | /* |
643 | * Copy to skb. This copy is needed here since the memory pointed by | |
644 | * hv_netvsc_packet cannot be deallocated | |
645 | */ | |
45326342 HZ |
646 | memcpy(skb_put(skb, packet->total_data_buflen), packet->data, |
647 | packet->total_data_buflen); | |
fceaf24a HJ |
648 | |
649 | skb->protocol = eth_type_trans(skb, net); | |
e3d605ed KS |
650 | if (csum_info) { |
651 | /* We only look at the IP checksum here. | |
652 | * Should we be dropping the packet if checksum | |
653 | * failed? How do we deal with other checksums - TCP/UDP? | |
654 | */ | |
655 | if (csum_info->receive.ip_checksum_succeeded) | |
656 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
657 | else | |
658 | skb->ip_summed = CHECKSUM_NONE; | |
659 | } | |
660 | ||
93725cbd HZ |
661 | if (packet->vlan_tci & VLAN_TAG_PRESENT) |
662 | __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), | |
663 | packet->vlan_tci); | |
fceaf24a | 664 | |
4baab261 | 665 | skb_record_rx_queue(skb, packet->channel-> |
e565e803 | 666 | offermsg.offer.sub_channel_index); |
5b54dac8 | 667 | |
9495c282 | 668 | net->stats.rx_packets++; |
48c38839 | 669 | net->stats.rx_bytes += packet->total_data_buflen; |
9495c282 | 670 | |
02fafbc6 GKH |
671 | /* |
672 | * Pass the skb back up. Network stack will deallocate the skb when it | |
9495c282 SH |
673 | * is done. |
674 | * TODO - use NAPI? | |
02fafbc6 | 675 | */ |
9495c282 | 676 | netif_rx(skb); |
fceaf24a | 677 | |
fceaf24a HJ |
678 | return 0; |
679 | } | |
680 | ||
f82f4ad7 SH |
681 | static void netvsc_get_drvinfo(struct net_device *net, |
682 | struct ethtool_drvinfo *info) | |
683 | { | |
7826d43f | 684 | strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); |
7826d43f | 685 | strlcpy(info->fw_version, "N/A", sizeof(info->fw_version)); |
f82f4ad7 SH |
686 | } |
687 | ||
4d447c9a HZ |
688 | static int netvsc_change_mtu(struct net_device *ndev, int mtu) |
689 | { | |
690 | struct net_device_context *ndevctx = netdev_priv(ndev); | |
691 | struct hv_device *hdev = ndevctx->device_ctx; | |
692 | struct netvsc_device *nvdev = hv_get_drvdata(hdev); | |
693 | struct netvsc_device_info device_info; | |
694 | int limit = ETH_DATA_LEN; | |
695 | ||
696 | if (nvdev == NULL || nvdev->destroy) | |
697 | return -ENODEV; | |
698 | ||
a1eabb01 | 699 | if (nvdev->nvsp_version >= NVSP_PROTOCOL_VERSION_2) |
4d447c9a HZ |
700 | limit = NETVSC_MTU; |
701 | ||
702 | if (mtu < 68 || mtu > limit) | |
703 | return -EINVAL; | |
704 | ||
705 | nvdev->start_remove = true; | |
792df872 | 706 | cancel_work_sync(&ndevctx->work); |
0a282538 | 707 | netif_tx_disable(ndev); |
4d447c9a HZ |
708 | rndis_filter_device_remove(hdev); |
709 | ||
710 | ndev->mtu = mtu; | |
711 | ||
712 | ndevctx->device_ctx = hdev; | |
713 | hv_set_drvdata(hdev, ndev); | |
714 | device_info.ring_size = ring_size; | |
715 | rndis_filter_device_add(hdev, &device_info); | |
5b54dac8 | 716 | netif_tx_wake_all_queues(ndev); |
4d447c9a HZ |
717 | |
718 | return 0; | |
719 | } | |
720 | ||
1ce09e89 HZ |
721 | |
722 | static int netvsc_set_mac_addr(struct net_device *ndev, void *p) | |
723 | { | |
724 | struct net_device_context *ndevctx = netdev_priv(ndev); | |
725 | struct hv_device *hdev = ndevctx->device_ctx; | |
726 | struct sockaddr *addr = p; | |
9a4c831e | 727 | char save_adr[ETH_ALEN]; |
1ce09e89 HZ |
728 | unsigned char save_aatype; |
729 | int err; | |
730 | ||
731 | memcpy(save_adr, ndev->dev_addr, ETH_ALEN); | |
732 | save_aatype = ndev->addr_assign_type; | |
733 | ||
734 | err = eth_mac_addr(ndev, p); | |
735 | if (err != 0) | |
736 | return err; | |
737 | ||
738 | err = rndis_filter_set_device_mac(hdev, addr->sa_data); | |
739 | if (err != 0) { | |
740 | /* roll back to saved MAC */ | |
741 | memcpy(ndev->dev_addr, save_adr, ETH_ALEN); | |
742 | ndev->addr_assign_type = save_aatype; | |
743 | } | |
744 | ||
745 | return err; | |
746 | } | |
747 | ||
316158fe RW |
748 | #ifdef CONFIG_NET_POLL_CONTROLLER |
749 | static void netvsc_poll_controller(struct net_device *net) | |
750 | { | |
751 | /* As netvsc_start_xmit() works synchronous we don't have to | |
752 | * trigger anything here. | |
753 | */ | |
754 | } | |
755 | #endif | |
1ce09e89 | 756 | |
f82f4ad7 SH |
757 | static const struct ethtool_ops ethtool_ops = { |
758 | .get_drvinfo = netvsc_get_drvinfo, | |
f82f4ad7 SH |
759 | .get_link = ethtool_op_get_link, |
760 | }; | |
761 | ||
df2fff28 GKH |
762 | static const struct net_device_ops device_ops = { |
763 | .ndo_open = netvsc_open, | |
764 | .ndo_stop = netvsc_close, | |
765 | .ndo_start_xmit = netvsc_start_xmit, | |
afc4b13d | 766 | .ndo_set_rx_mode = netvsc_set_multicast_list, |
4d447c9a | 767 | .ndo_change_mtu = netvsc_change_mtu, |
b681b588 | 768 | .ndo_validate_addr = eth_validate_addr, |
1ce09e89 | 769 | .ndo_set_mac_address = netvsc_set_mac_addr, |
5b54dac8 | 770 | .ndo_select_queue = netvsc_select_queue, |
316158fe RW |
771 | #ifdef CONFIG_NET_POLL_CONTROLLER |
772 | .ndo_poll_controller = netvsc_poll_controller, | |
773 | #endif | |
df2fff28 GKH |
774 | }; |
775 | ||
c996edcf HZ |
776 | /* |
777 | * Send GARP packet to network peers after migrations. | |
778 | * After Quick Migration, the network is not immediately operational in the | |
779 | * current context when receiving RNDIS_STATUS_MEDIA_CONNECT event. So, add | |
122a5f64 | 780 | * another netif_notify_peers() into a delayed work, otherwise GARP packet |
c996edcf | 781 | * will not be sent after quick migration, and cause network disconnection. |
891de74d | 782 | * Also, we update the carrier status here. |
c996edcf | 783 | */ |
891de74d | 784 | static void netvsc_link_change(struct work_struct *w) |
c996edcf HZ |
785 | { |
786 | struct net_device_context *ndev_ctx; | |
787 | struct net_device *net; | |
2ddd5e5f | 788 | struct netvsc_device *net_device; |
891de74d | 789 | struct rndis_device *rdev; |
3a494e71 HZ |
790 | bool notify, refresh = false; |
791 | char *argv[] = { "/etc/init.d/network", "restart", NULL }; | |
792 | char *envp[] = { "HOME=/", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL }; | |
891de74d HZ |
793 | |
794 | rtnl_lock(); | |
c996edcf | 795 | |
122a5f64 | 796 | ndev_ctx = container_of(w, struct net_device_context, dwork.work); |
2ddd5e5f | 797 | net_device = hv_get_drvdata(ndev_ctx->device_ctx); |
891de74d | 798 | rdev = net_device->extension; |
2ddd5e5f | 799 | net = net_device->ndev; |
891de74d HZ |
800 | |
801 | if (rdev->link_state) { | |
802 | netif_carrier_off(net); | |
803 | notify = false; | |
804 | } else { | |
805 | netif_carrier_on(net); | |
806 | notify = true; | |
3a494e71 HZ |
807 | if (rdev->link_change) { |
808 | rdev->link_change = false; | |
809 | refresh = true; | |
810 | } | |
891de74d HZ |
811 | } |
812 | ||
813 | rtnl_unlock(); | |
814 | ||
3a494e71 HZ |
815 | if (refresh) |
816 | call_usermodehelper(argv[0], argv, envp, UMH_WAIT_EXEC); | |
817 | ||
891de74d HZ |
818 | if (notify) |
819 | netdev_notify_peers(net); | |
c996edcf HZ |
820 | } |
821 | ||
822 | ||
84946899 S |
823 | static int netvsc_probe(struct hv_device *dev, |
824 | const struct hv_vmbus_device_id *dev_id) | |
df2fff28 | 825 | { |
df2fff28 GKH |
826 | struct net_device *net = NULL; |
827 | struct net_device_context *net_device_ctx; | |
828 | struct netvsc_device_info device_info; | |
5b54dac8 | 829 | struct netvsc_device *nvdev; |
df2fff28 GKH |
830 | int ret; |
831 | ||
5b54dac8 HZ |
832 | net = alloc_etherdev_mq(sizeof(struct net_device_context), |
833 | num_online_cpus()); | |
df2fff28 | 834 | if (!net) |
51a805d0 | 835 | return -ENOMEM; |
df2fff28 | 836 | |
1b07da51 HZ |
837 | netif_carrier_off(net); |
838 | ||
df2fff28 | 839 | net_device_ctx = netdev_priv(net); |
9efd21e1 | 840 | net_device_ctx->device_ctx = dev; |
2ddd5e5f | 841 | hv_set_drvdata(dev, net); |
891de74d | 842 | INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_link_change); |
792df872 | 843 | INIT_WORK(&net_device_ctx->work, do_set_multicast); |
df2fff28 | 844 | |
df2fff28 GKH |
845 | net->netdev_ops = &device_ops; |
846 | ||
77bf5487 KS |
847 | net->hw_features = NETIF_F_RXCSUM | NETIF_F_SG | NETIF_F_IP_CSUM | |
848 | NETIF_F_TSO; | |
08cd04bf | 849 | net->features = NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_SG | NETIF_F_RXCSUM | |
77bf5487 | 850 | NETIF_F_IP_CSUM | NETIF_F_TSO; |
6048718d | 851 | |
7ad24ea4 | 852 | net->ethtool_ops = ðtool_ops; |
9efd21e1 | 853 | SET_NETDEV_DEV(net, &dev->device); |
df2fff28 | 854 | |
692e084e HZ |
855 | /* Notify the netvsc driver of the new device */ |
856 | device_info.ring_size = ring_size; | |
857 | ret = rndis_filter_device_add(dev, &device_info); | |
858 | if (ret != 0) { | |
859 | netdev_err(net, "unable to add netvsc device (ret %d)\n", ret); | |
df2fff28 | 860 | free_netdev(net); |
2ddd5e5f | 861 | hv_set_drvdata(dev, NULL); |
692e084e | 862 | return ret; |
df2fff28 | 863 | } |
692e084e HZ |
864 | memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN); |
865 | ||
5b54dac8 HZ |
866 | nvdev = hv_get_drvdata(dev); |
867 | netif_set_real_num_tx_queues(net, nvdev->num_chn); | |
868 | netif_set_real_num_rx_queues(net, nvdev->num_chn); | |
5b54dac8 | 869 | |
a68f9614 HZ |
870 | ret = register_netdev(net); |
871 | if (ret != 0) { | |
872 | pr_err("Unable to register netdev.\n"); | |
873 | rndis_filter_device_remove(dev); | |
874 | free_netdev(net); | |
1b07da51 HZ |
875 | } else { |
876 | schedule_delayed_work(&net_device_ctx->dwork, 0); | |
a68f9614 HZ |
877 | } |
878 | ||
df2fff28 GKH |
879 | return ret; |
880 | } | |
881 | ||
415b023a | 882 | static int netvsc_remove(struct hv_device *dev) |
df2fff28 | 883 | { |
2ddd5e5f | 884 | struct net_device *net; |
122a5f64 | 885 | struct net_device_context *ndev_ctx; |
2ddd5e5f S |
886 | struct netvsc_device *net_device; |
887 | ||
888 | net_device = hv_get_drvdata(dev); | |
889 | net = net_device->ndev; | |
df2fff28 | 890 | |
df2fff28 | 891 | if (net == NULL) { |
415b023a | 892 | dev_err(&dev->device, "No net device to remove\n"); |
df2fff28 GKH |
893 | return 0; |
894 | } | |
895 | ||
4d447c9a HZ |
896 | net_device->start_remove = true; |
897 | ||
122a5f64 HZ |
898 | ndev_ctx = netdev_priv(net); |
899 | cancel_delayed_work_sync(&ndev_ctx->dwork); | |
792df872 | 900 | cancel_work_sync(&ndev_ctx->work); |
122a5f64 | 901 | |
df2fff28 | 902 | /* Stop outbound asap */ |
0a282538 | 903 | netif_tx_disable(net); |
df2fff28 GKH |
904 | |
905 | unregister_netdev(net); | |
906 | ||
907 | /* | |
908 | * Call to the vsc driver to let it know that the device is being | |
909 | * removed | |
910 | */ | |
df06bcff | 911 | rndis_filter_device_remove(dev); |
df2fff28 GKH |
912 | |
913 | free_netdev(net); | |
df06bcff | 914 | return 0; |
df2fff28 GKH |
915 | } |
916 | ||
345c4cc3 | 917 | static const struct hv_vmbus_device_id id_table[] = { |
c45cf2d4 | 918 | /* Network guid */ |
8f505944 | 919 | { HV_NIC_GUID, }, |
c45cf2d4 | 920 | { }, |
345c4cc3 S |
921 | }; |
922 | ||
923 | MODULE_DEVICE_TABLE(vmbus, id_table); | |
924 | ||
f1542a66 | 925 | /* The one and only one */ |
fde0ef9b | 926 | static struct hv_driver netvsc_drv = { |
d31b20fc | 927 | .name = KBUILD_MODNAME, |
345c4cc3 | 928 | .id_table = id_table, |
fde0ef9b S |
929 | .probe = netvsc_probe, |
930 | .remove = netvsc_remove, | |
d4890970 | 931 | }; |
f1542a66 | 932 | |
a9869c94 | 933 | static void __exit netvsc_drv_exit(void) |
fceaf24a | 934 | { |
768fa219 | 935 | vmbus_driver_unregister(&netvsc_drv); |
fceaf24a HJ |
936 | } |
937 | ||
1fde28cf | 938 | static int __init netvsc_drv_init(void) |
df2fff28 | 939 | { |
fa85a6c2 HZ |
940 | if (ring_size < RING_SIZE_MIN) { |
941 | ring_size = RING_SIZE_MIN; | |
942 | pr_info("Increased ring_size to %d (min allowed)\n", | |
943 | ring_size); | |
944 | } | |
768fa219 | 945 | return vmbus_driver_register(&netvsc_drv); |
df2fff28 GKH |
946 | } |
947 | ||
26c14cc1 | 948 | MODULE_LICENSE("GPL"); |
7880fc54 | 949 | MODULE_DESCRIPTION("Microsoft Hyper-V network driver"); |
fceaf24a | 950 | |
1fde28cf | 951 | module_init(netvsc_drv_init); |
a9869c94 | 952 | module_exit(netvsc_drv_exit); |